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The climate is the result of a global scale circulatory system, the movement of the mass of air surrounding the balloon under the influence of solar radiation and the constant exchange with ocean floor in a very complex dynamic equilibrium, governed by a series of factors whose influence just beginning to understand, and yet, we are confident that we are altering them irreversibly.

The unitary and global climate was perceived as early last century. We guessed that atmosphere and ocean had a very important role in the average temperature of the planet and of the energy coming from the Sun was, somehow, retained by the atmosphere.

Just over 100 years ago, people around the world began burning more coal and oil for homes, factories, and transportation. Burning these fossil fuels released carbon dioxide and other greenhouse gases into the atmosphere. These greenhouse gases have caused the Earth to warm more rapidly than in the past.

How much warming has occurred? The Intergovernmental Panel on Climate Change (IPCC, for its acronym in English, Intergovernmental Panel on Climate Change), composed of scientists from around the world indicate that during the last 100 years, the surface air temperature increased on average 0.6 ° Celsius (1.1 ° F). This may not sound like a big change, but even one degree can affect the Earth. Below are some effects of climate change now occurring.

Sea level is rising. During the twentieth century, sea level has risen about 15 cm (6 inches) due to melting glacier ice and expansion of warmer seawater. Models predict that sea levels could rise up to 59 cm (23 inches) during the XXI Century, threatening coastal communities, wetlands, and coral reefs.Arctic sea ice is melting. The thickness of summer sea ice is about half of what it was in 1950. The melting ice could lead to changes in ocean circulation. Furthermore, the melting ice of the Arctic warming accelerates.The glaciers and permafrost layer is melting. During the past 100 years, mountain glaciers in all areas of the world have decreased in size, as the extent of permanently frozen layer in the Arctic. The Greenland ice sheet is melting rapidly.The surface temperatures are rising sea. In recent decades, warmer waters in shallow oceans have contributed to the death of nearly a quarter Coralde reefs worldwide. Many of the coral animals died from impairment by bleaching, a process related to warmer water.Higher temperatures is rising lakes. The temperatures of the biggest lakes around the world have increased dramatically. This has increased algae growth, favored the spread of invasive species, increased stratification in lakes, and decreased the level of the lakes.More intense rainfall causes flooding in many regions cñalids temperatures have caused heavier rainfall in some regions. This can cause flooding.Extreme drought is increasing. Higher temperatures cause a higher rate of evaporation and more drought in some areas of the world.Crop decrease. Higher temperatures and extreme drought cause a decrease in agricultural productivity worldwide. Decrease in agricultural productivity could lead to food shortages in many social implications.Ecosystems are changing. As temperatures warm, some species will migrate to colder places, towards an ideal ecosystem, or die. Some of the species particularly vulnerable include endangered species, coral reefs, and polar animals. Warming has also caused changes in the timing of events in spring and extending the growing season.Hurricanes have changed in frequency and strength. There is evidence that the number of Atlantic hurricanes has increased since 1970. Scientists continue to study to determine if the weather is the cause.More frequent heat waves. It is likely that heat waves become more common and more frequent in areas of the world.Warmer temperatures affect human health has been an increase in heat-related deaths, and more allergy attacks because the pollen season has been extended. They have also been some changes in animals carry disease like mosquitoes.li> The seawater is becoming more acidic. The carbon dioxide that dissolves in the oceans is making seawater more acidic. Could have impacts on coral reefs and other marine life. aca te la dejo con mas de 100 palabras tenes mucho para leer